The HDP-500 trailer series high-pressure pump from Hammelmann Corp. has a fluid end that is sealed, preventing any water leakage during operation. The 750 hp range pump is convertible from 5,000 to 45,000 psi. It combines a compact integral speed reduction gear end with the concept of a vertical configuration. The vertical configuration channels oscillating forces directly downward into the base structure. Unwanted lateral oscillations as produced by horizontal pumps do not occur. The integral speed reducer with twin helical gears arranged in a herringbone configuration ensures smooth running and even power transmission without axially loading the bearings. A selection of gear ratios is available to allow the optimal choice of driver. The compact construction eliminates the need for an external gearbox and prevents rotary oscillation. Mechanical efficiency is in excess of 95 percent. 800/783-4935; www.hammelmann.com.